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For a project I’m working on with Jelmer (JDJelectronics) we have to communicate with a SIMCOM GPRS modem.
I wrote an interactive sketch that can handle the communication (with so called “AT” commands) with a GPRS modem. Parts of the sketch can be used to write your own, dedicated, commands list to setup and use your GPRS modem.
The sketch is great for testing and understanding your GPRS modem. You can find the sketch on github.